NostalgiaVX P1a

Oi, time for a small update that improves some of the work-in-progress things like the emitter color palette. I am also currently looking into another approach that uses the LPV for cheaper proper VoxelPT, which would give the lighting a more room-filling quality again at a fairly good performance cost with little extra denoising effort required.

Changelog:

- mapped a few more noncubics
- added a few settings for the LPV
- disabled lpv fog contribution by default
- adjusted accumulation
- reworked emission color palettte to fit better with the overall visuals